While you wait for answers, we may have found some information which could help you.
Success
Message
what does F14 mean and F5?
no domestic hot water?
water sensor?
water goes cold during shower?
max of 50 degrees hot water?
were do I get a diagram and information on airpressureswitch 105he?
charging system up?
gas neoon flashing?
no hot water and pressure valve is on red and water is leakiing outside?
burner going of after 2 or 3 minutes and on?
Fan light flashing?
pressure switch?